I asked nonetheless because there had been a quick fix like the one you mention, for another piece of scenery, the FSdreateam Vegas (KLAS).
A simple user there, provided a fix in a zipped .bgl, on the developper forum, and that third party fix solved the huge plateau effect in Vegas.
And that fix, actually made my buy the product (a scenery that causes a serious plateau effect is a no-go for me ).
So, I tried some time ago to go and ask on the Madrid dev's forum, unfortunately, it's not Aerosoft (they're only the publisher), the dev is Simwings,
and their forum is german speaking only, I could not even register their forum.
I asked the same Simwings, by the way, to consider this plateau issue for their next awaited scenery, Anchorage, Alsaka. As a matter of fact, even the defaut Anchorage produced weird plateau with your 38m mesh. Havent been given a reply yet, as to they will or wont adress this issue before the release of their scenery.
Thanks again anyway Justin, looking forward to trying a Madrid fix from you one day. Would it help if we give you the FS alitude of the Aerosoft LEMD?